x²+x-30=(x-5)(x+6)
x²+x-30=0
D=1+120=121=11²
x(1)=(-1+11)/2=5
x(2)=(-1-11)/2 =-6
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x²+x-30=(x-5)(x+6)
x²+x-30=0
D=1+120=121=11²
x(1)=(-1+11)/2=5
x(2)=(-1-11)/2 =-6